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## Re: Applying function to vector by index

**From**: |
Mike Miller |

**Subject**: |
Re: Applying function to vector by index |

**Date**: |
Mon, 9 Dec 2002 10:51:45 -0600 (CST) |

On Mon, 9 Dec 2002, Iago Mosqueira wrote:
>* I have a long vector classified in ten bins of different length*
>* according to another vector.*
How does the second vector specify the bins in the first vector? Can you
give an example?
>* I want to estimate the variance, or any other function, of the values*
>* from the first vector for each of the categories described by the*
>* second, without using a loop. Is there any obvious way of doing this I*
>* am overlooking? In R one could do*
>
>* sapply(split(d,idx),var)*
>
>* where d is my data vector and idx the index vector.*
It depends on what is in 'idx'. It could be something like this...
var(d(idx))
...and it would be exactly that if the elements of idx specified the
elements of d for which the variance was to be computed.
Mike
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**Applying function to vector by index**, *Iago Mosqueira*, `2002/12/09`
**Re: Applying function to vector by index**,
*Mike Miller* **<=**
**Re: Applying function to vector by index**, *Paul Kienzle*, `2002/12/09`
**Re: Applying function to vector by index**, *Iago Mosqueira*, `2002/12/09`
**Re: Applying function to vector by index**, *Paul Kienzle*, `2002/12/09`
**Re: Applying function to vector by index**, *Paul Kienzle*, `2002/12/09`
**Re: Applying function to vector by index**, *Andy Adler*, `2002/12/09`
**Re: Applying function to vector by index**, *Schloegl Alois*, `2002/12/10`
**Re: Applying function to vector by index**, *Paul Kienzle*, `2002/12/12`
**Re: Applying function to vector by index**, *Andy Adler*, `2002/12/12`
**Re: Applying function to vector by index**, *Schloegl Alois*, `2002/12/12`
**Re: Applying function to vector by index**, *Paul Kienzle*, `2002/12/12`